Nanotubes

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Scope Note: Carbon nanotubes are extremely thin (their diameter is
about 10,000 times smaller than a human hair), hollow cylinders made of carbon atoms.
Nanotubes, depending on their structure, can be metals or semiconductors. They are
also extremely strong materials and have good thermal conductivity. The above characteristics
have generated strong interest in their possible use in nano-electronic and nano-mechanical
devices. For example, they can be used as nano-wires or as active components in
electronic devices such as the field-effect transistor shown in this site.
Source: http://www.research.ibm.com/nanoscience/nanotubes.html